I have a DuoMid and dearly love it. Some would say that the SoloMid offers more places to set it up since it has a smaller footprint. I don't think that is much of a worry since the Mids have no floor.
I just returned from a 9 day trip on the Colorado Trail and Continental Divide Trail. I was hit with very high winds, pounding rain, sleet, and had at times limited sites to set it up.
Each night I slept like a baby, even in the middle of the storms. The DuoMid held up to huge wind gusts and never whimpered.
I set my DuoMid up with the trekking pole offset from center to give me much more room. It comes with a 6" pole extender, and my poles are adjustable, so I can really set it up off center. Also, Ron will send you two 12" pole extenders free if you get the DuoMid...just ask for them. This allows you to set it up using two trekking poles in an A-frame style (like the SoloMid sets up). This takes care of the pole in the middle of the shelter.
I use a Katabatic bivy. I too feared the claustrophobia feeling until my first night of use. My bivy is plenty big, large enough to store a few things in beside me or in the hood. Plus, it ties up off the face. The Mids have loops in the corners to tie up the bivy hood.
I couldn't ask for a better shelter than my DuoMid. I usually go solo. But, there is room for 2. I always store my gear in the Mid with me. I like having the extra room than the SoloMid, plus the Duo can handle tougher weather.